Divisor 21531

To determine if any number is divisible by 21531, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 7177 - then it is divisible by 21531.

The following tests must pass:

• Test if a number is divisible by 3
• The "Brian Mernoff Test" for Divisibility by 7177

Easy!